remove bogus test

Summary:
the names in /usr/share/X11/xkb/symbols/us are not stable,
the us keyboard name recently switched from
"English (US, international with dead keys)"
to "English (US, intl., with dead keys)"
breaking the tests,
so there is no point to test for these names on our side

Test Plan: tests now pass

Reviewers: #plasma, sebas

Reviewed By: #plasma, sebas

Subscribers: bshah, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D8109